Panjaitan, L. N., T. R. Joni, D. Handarini, and L. Kaluge. “Improvement of Teachers’ Ability to Carry on Positive Expectation Towards Students”. ANIMA Indonesian Psychological Journal, Vol. 27, no. 1, Oct. 2011, pp. 27-33, doi:10.24123/aipj.v27i1.4163.